Right of use assets and related obligations - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Right of use assets	$ 214,854		$ 332,512
Operating Lease obligations	179,855		295,188
Lease cost	369,263	$ 292,235
Fixed lease payments	285,890
Variable lease cost	$ 83,373
Weighted average lease term	1 year 3 months 18 days
Accounting Standards Update 2016-02 [Member]
Right of use assets			332,512
Operating Lease obligations			$ 295,188